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So a 2,000-square-foot crawl space would need a 40 cfm exhaust fan. It's pulling just a little bit of air from the crawl space. The problem is that you don't really know where the makeup air for the crawl space is coming from. Yes, the code specifies a pathway for air to move into the crawl space from the house, but air doesn't always follow those arrows in the diagrams.
A crawl space that doesn't have proper air flow will have problems with moisture, mold, and wood rot. Humidity and condensation in a crawl space is a recipe for disaster. Excess moisture leads to mold growth, wood rot, and foul odors, causing issues for your home's health, air quality, and value. At Regional Waterproofing, we specialize in preventing these problems with our patented crawl space dehumidifier and ventilation fan.